Sig Sauer P320 Sig 320ca9m18msca P320 M18 9mm 3.9 10r *ca*coy

Sig Sauer P320 M18 9mm 3.9" Barrel 10-Round California Compliant Pistol

Name: Sig Sauer P320 M18 9mm 3.9" Barrel 10-Round California Compliant Pistol
Brand: Sig Sauer
SKU: 120911816
Price: 699.99 USD
Availability: OutOfStock

Sig Sauer

SKU:

120911816

UPC:

798681691968

MPN:

320CA9M18MSCA

$699.99

Current Stock:

The Sig Sauer P320 M18 9mm is the California-compliant version of the pistol that's trusted by every branch of the U.S. Military and serves as the official sidearm of the Marine Corps. If you're a California resident who wants proven military-grade reliability in a carry-sized package, this is the real deal—same engineering that's been tested in the field, now available to you in a configuration that meets state requirements.

Built on the modular P320 platform, the M18 delivers the accuracy and durability the military demands in a compact 3.9-inch barrel design that works hard in a carry holster. The slide comes optic-ready and finished in coyote tan to match the grip module, giving it that purposeful, no-nonsense aesthetic. You get three 10-round steel magazines, SIGLITE night sights, and a removable night sight rear plate—everything you need to run it right out of the box. At 28.1 ounces with a 5.8-inch sight radius, it's balanced for shootability without excess bulk.

The P320 platform's modular design means your FCU (fire control unit) and grip module are separate, and the slide is compatible with Sig's ROMEO-X, ROMEO1 PRO, and ROMEO2 red dot optics if you want to upgrade down the road. The M1913 rail lets you mount a light or laser. Whether you're training, carrying, or heading to the range, this is a platform that scales to your needs and won't let you down.

Key Features

Military-proven P320 platform trusted by U.S. Armed Forces
Optic-ready slide compatible with ROMEO-series red dot optics
SIGLITE night sights with removable rear plate included
Modular design with coyote tan finish matching military aesthetic
Three 10-round magazines included
M1913 picatinny rail for accessories
Compact carry size with 3.9-inch barrel
Manual safety with striker-fired action

Specifications

Caliber	9mm Luger
Barrel Length	3.9 inches
Overall Length	7.2 inches
Height	5.5 inches
Width	1.6 inches
Weight	28.1 ounces
Sight Radius	5.8 inches
Magazines Included	Three 10-round steel magazines
Sights	SIGLITE night sights with removable rear plate
Slide Finish	Coyote PVD
Slide Material	Stainless steel
Barrel Material	Carbon steel
Grip Module	Carry polymer, medium, coyote tan
Trigger	Striker-fired, standard curved
Safety	Manual safety
Accessory Rail	M1913 picatinny
Optic Ready	Yes—compatible with ROMEO-X, ROMEO1 PRO, ROMEO2
State Compliance	California compliant

Frequently Asked Questions

Is the P320 M18 California legal?

Yes. This model is specifically designed to meet California's requirements and is sold as California-compliant.

Can I mount a red dot sight on this slide?

Absolutely. The slide is optic-ready and directly compatible with Sig's ROMEO-X, ROMEO1 PRO, and ROMEO2 red dot optics.

What comes in the box?

The pistol comes with three 10-round steel magazines, SIGLITE night sights, and a removable night sight rear plate.

What's the difference between this and the standard P320?

The M18 is the compact military version with a 3.9-inch barrel and modified ergonomics. This California-compliant variant meets state regulations on magazine capacity and features.

Firearm Shipments:

To buy rifles or shotguns, you must be 18 years old, and for handguns, actions, or receivers, the minimum age is 21. By placing an order for this firearm, you confirm that you are the legitimate transferee/buyer, meet the legal age requirements, and comply with all Federal, State, and local laws and regulations necessary to purchase this firearm.

We only ship firearms to valid Federal Firearms License (FFL) holders. At checkout we provide a FFL locator for your convenience.

We will need a copy of the FFL’s license to facilitate the process, kindly request your dealer to email us a copy of their FFL, as we cannot dispatch the firearm until we receive this document. It is imperative for the buyer to choose their FFL dealer, ensure they are willing to facilitate the transfer, and have them email their FFL copy to BOSQUE Outdoors. To avoid any confusion, the customer's name or order number must be mentioned in the email containing the FFL.

Email: [email protected]

Prior to placing an order, it is the buyer's responsibility to understand and adhere to their state's firearm regulations.
The buyer should verify with their receiving dealer that the chosen firearm is legally permissible in their state.
The buyer is accountable for any transfer fees or background check charges imposed by the receiving dealer. If the designated dealer declines to accept the firearm delivery, the buyer assumes responsibility for shipping costs to retrieve the firearm and resend it to an accommodating dealer.
Handguns will be shipped using air transportation, while long guns can be shipped using ground methods. If your order includes a mix of firearm and non-firearm items, BOSQUE Outdoors will send the firearm(s) to your selected FFL dealer and the remaining non-firearm items to your billing address.
Firearms cannot be returned to BOSQUE Outdoors; please contact the manufacturer for warranty claims.
Firearms refused by the FFL Dealer or which cannot be transferred due to a failed background check are subject to a $75 restocking fee plus 10% of the purchase price.